Graphic cards also known as video cards, graphic adapters or display cards are what you see while you use your monitor. Computers today mostly come with the video controller with the video part integrated onto the motherboard. If you are having problems with integrated graphics than today’s computers can easily install a graphic card and bypass the built on internal one but make sure that you can disable the controller on the motherboard if it gives you trouble. That is one scenario but if you need to install the graphics card ironically the integrated one was still work in helping you out by displaying what you are doing to install the graphics card. Just make sure that you have the installation files that came with your graphics card if you have bought it from a computer store.
Now take into consideration, the number of colors a video card displays is determined by its bid depth, which simply means the number of bits it uses to store information about each pixel. Let’s say for example and eight bit video card uses eight bits to start information about each pixel. At the end of it, only 256 colors can be displayed. The more bits a graphics card has the better the display. This is why so many applications that use video or graphics demand more and more bits of data coming in. If you ever wonder why people that want high definition movies and clear display crave for that experience, now you know. That’s the same with game enthusiasts wanting more and more quality experience when playing their games either off-line or online.
Now let’s look deeper into what a graphic card does when sending information to a cathode Ray tube(CRT) monitor. In another blog post I mentioned that the processor is the brain of the computer. Well, it sends that digital video data onto the graphics card. The video card digital to analog converter(DAC) converts the digital video data to an analog signal. Then it gets sent to the cable onto the monitor which separates the analog signal into red green and blue signals. Electron guns fire these three signals to the front of the monitor and then the image is displayed on the screen when the electrons hit the phosphor dots on the back of the screen. Remember, this is the explanation for CRT monitors and the basic instructions the processor use to send to a video card. Although LCD monitors also uses a processor and sometimes a video card, they work quite differently and the analog signal reverts back to digital.
Okay the way LCD works is this, first a panel of florescent tools emits light waves through a polarizing glass filter, which guides the light towards the layer of cells. Second, as the light passes true and electrical charge from a transistor causes some of the cells to twist making the light waves bend as they pass through a color filter. Third, then the light reaches the second polarizing glass filter light is allowed to pass through any cells that line up at the same angle as the first polarizing glass filter. The absence and presence up current like costly image appear on the display. I would like to state otherwise but facts is facts no matter how it is put. The processor sends a digital video data in almost the same way to the video card to LCD monitor. Laptops, smart phones, and other devices that utilizes LCD goes to the same format.
I hope this about covers it about what a graphics card in the computer is. It is complicated a bit but now you see why and I try explain as best as I could.